Pump type meaning: If 40LG12-15 40- Import and export diameter (mm) LG- high-rise building feed pump (high speed) 12- flow (m3 / h) 15- single-stage lift (M) 200QJ20-108 / 8 200 --- Said the frame number 200 QJ --- submersible pump 20-flow 20m3 / h 108 --- head 108M 8 --- series of 8 stages The basic structure of the pump: motor, coupling, pump head (body) and machine Block (horizontal). The main parameters of the pump are: flow, expressed in Q, the unit is M3 / H, L / S. Lift, expressed in H, The parameter is very important, especially when it is used in suction type water supply equipment. It is very important for the submersible pump and rated current parameter (A), especially when it is used in frequency conversion water supply equipment. The main parameters of the motor are motor power (KW) r / min), rated voltage (V), rated current (A). Coupling pump head (body _) horizontal base What is the flow of what is the letter that with several units of measurement how to convert how to convert into weight and formula A: The volume of liquid discharged by the pump per unit time is called the flow rate, and the flow rate is expressed by Q. The unit of measurement is: m3 / h, l / s, L / s = 3.6 m3 / h = m3 / min = 60L / min G = Qρ G is the weight ρ is the proportion of liquid Example: a pump flow 50 m3 / h, Water pumping hourly weight of water ρ 1000kg / m3 Solution: G = Qp = 50 × 1000 (m3 / h · kg / m3) = 50000kg / h = 50t / h What is the use of what the head that What unit of measurement and pressure conversion and formula A: The weight of the liquid obtained by the unit weight of the liquid is called pump head lift. Pump lift including suction, approximately pump outlet and inlet pressure difference. Head with H said that the unit is meters the pressure of the pump is expressed by P in units of Mpa and H = P / ρ, H = 1 kg / cm2 / 1000 kg / m3 if P is 1 kg / cm2) / (1000 kg / m3) = (10000 kg / m2) / 1000 kg / m3 = 10m 1Mpa = 10kg / m2m2 H = P2-P1 / ρ (P2 = outlet pressure P1 = inlet pressure) Pump efficiency formula called how to answer: refers to the effective pump power and shaft power ratio. Η = Pe / P pump power usually refers to the input power, that is, the prime mover to the shaft power, it is also known as shaft power, with P is the effective power which is the product of the lift of the pump and the mass flow rate and the acceleration of gravity Pe = ρg QH (W) or Pe = γQH / 1000 (KW) ρ: Density of the liquid pumped by the pump (kg / m3) Gravity γ = ρg (N / m3) of liquid to be conveyed g: Gravitational acceleration (m / s) Mass flow Qm = ρQ (t / h or k g / s) What is the rated flow rate, rated speed, rated head A: According to set the pump performance parameters of the pump design, and to achieve the best performance, as the pump rated performance parameters, usually refers to the product catalog or sample Specified parameter values ​​such as: 50-125 Flow 12.5 m3 / h is the rated flow, head 20m is the rated head, speed 2900 rpm / divided into rated speed What is the NPSH? : Pump in the liquid at the impeller at the entrance due to a certain vacuum pressure will produce vapor, vaporization of bubbles in the impact of the liquid particle movement, the impeller and other metal surface erosion, thus undermining the impeller and other metals, vacuum pressure Called vaporization pressure, NPSH refers to the per unit weight of the liquid at the pump inlet with excess energy that exceeds the vaporization pressure. The unit is marked with meters (NPSH) r. Suction is the necessary NPSH Δh: That is, the pump allows the suction of liquid vacuum, that is, the allowable installation height of the pump in meters. Stroke = standard atmospheric pressure (10.33 meters) - NPSH - safe amount (0.5 meters) 10.33 meters. For example: a pump must steam Etching allowance of 4.0 meters, seeking suction Δh solution: Δh = 10.33-4.0-0.5 = 5.83 meters What is the pump characteristic curve, including several aspects of what effect A: The curve that represents the relationship between the main performance parameters is usually called Centrifugal pump performance curve or characteristic curve, in essence, centrifugal pump performance curve is the external manifestation of the movement of the liquid in the pump, obtained by the actual measurement.The characteristic curve includes: flow - lift curve (QH), flow - efficiency curve Q-η, QN, Q- (NPSH) r, the performance curve is the arbitrary flow point of the pump. Relative lift, power, efficiency and NPSH value, this group of parameters is called the working state, referred to as working conditions or conditions point, the highest point of centrifugal pump efficiency conditions known as the best conditions point, the best work The condition point is generally the design condition point.General centrifugal pump rated parameters that the design condition point and the best condition point coincide or very close to.Efficient operation in the practice of the interval, that is, energy saving, but also to ensure the normal operation of the pump, therefore Understand the performance parameters of the pump is very important What is the pump performance test bench A: Through precision instruments Test equipment to determine the full performance of the pump parameters for the full performance test bench. National standard accuracy of B. Flow using precision worm gear flow meter measured head pressure gauge with precision measurement of suction vacuum gauge. Precision shaft power Power machine measurement. Tachometer measured. Efficiency according to the measured value: n = rQ102 calculation.

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